Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	$ 179	$ 7	$ 326	$ 90
Transfers Out of Level 3	(115)	(280)	(297)	(529)
Transfers Into or Out of Level 3, Net	64	(273)	29	(439)
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	135	2	254	85
Transfers Out of Level 3	(85)	(71)	(162)	(171)
Transfers Into or Out of Level 3, Net	50	(69)	92	(86)
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	1		1
Transfers Out of Level 3			(10)	(7)
Transfers Into or Out of Level 3, Net	1		(9)	(7)
ABS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	15		20
Transfers Out of Level 3	(28)	(118)	(123)	(223)
Transfers Into or Out of Level 3, Net	(13)	(118)	(103)	(223)
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	18		18
Transfers Into or Out of Level 3, Net	18		18
Trading Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	10	5	33	5
Transfers Out of Level 3	(2)	(91)	(2)	(128)
Transfers Into or Out of Level 3, Net	$ 8	$ (86)	$ 31	$ (123)